(Seattle, WA)  --  Now that the Mariners' season is over, three pitchers on the staff are considering having surgery during the offseason.  Taijuan Walker is experiencing irritation in his right foot.  Reliever Steve Cishek may undergo a procedure for a labrum tear in his hip.  And reliever Tony Zych could have shoulder surgery, a procedure Mariners general manager Jerry DiPoto says would be more of a "cleanup."